process.stdin.resume();
process.stdin.setEncoding('ascii');

var input_stdin = "";
var input_stdin_array = "";
var input_currentline = 0;

process.stdin.on('data', function (data) {
    input_stdin += data;
});

process.stdin.on('end', function () {
    input_stdin_array = input_stdin.split("\n");
    main();    
});

function readLine() {
    return input_stdin_array[input_currentline++];
}

/////////////// ignore above this line ////////////////////

function getFactorial(n){
    if(n===1)
        return 1;
    
    return n*(getFactorial(n-1));
}

function countArray(n, k, x) {
    // Return the number of ways to fill in the array.
    
    let valor = getFactorial(k)/(getFactorial(k - (n-2))*getFactorial(n-2));
    
    return valor;
}

function main() {
    var n_temp = readLine().split(' ');
    var n = parseInt(n_temp[0]);
    var k = parseInt(n_temp[1]);
    var x = parseInt(n_temp[2]);
    var answer = countArray(n, k, x);
    process.stdout.write("" + answer + "\n");

}